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An integrated amp with... integrity

Stereo. Two track for two ears. Still the gold standard for so much music listening today. Onkyo honors the simplicity and purity of stereo delivery with the A-9070 integrated amp, a meticulously engineered component that lives to treat both channels of your music with intensive, calibrated, and individualized attention.

There's plenty of power for demanding speakers. 75 watts pure channel of toned sonic muscle. High Instantaneous-Current Capability (HICC) uses four beefy on-board capacitors to provide instant energy for fast transients and punchy percussive attacks, while providing authoritative control to assist the speakers' fast recovery for the next musical challenge.

Distortion destroyer

With the A-9070 integrated amp, Onkyo has declared war on distortion. Their Dynamic Intermodulation Distortion Reduction Circuitry (DIDRC) helps to dampen and reduce super high frequency distortion, a common issue for today's digital music sources. Parallel push-pull amplification works to reduce other possible sources of distortion to inaudible levels. The unit's case is constructed with vibration damping in mind, to reduce yet another possible source of sound degradation. And despite tipping the scale at a hair under 40 lbs., it's attractive: sleek and minimalist.

Your digital sources, polished

The A-9070's blend of power and precision can put fresh sparkle in classic music sources like a turntable or tape deck. And Onkyo is dead serious about making the most out of your digital sources. Two Wolfson® 24-bit/192 kHz digital-to-analog converters (DACs), dedicated to each channel, take a stream of 1s and 0s entering the unit from the optical and coaxial digital inputs and build them into beautiful music. Many of the A-9070's competitors need an external DAC to interface with disc players or streaming digital media players like a Sonos Connect® or Apple TV®. Onkyo coddled your digital sources with world-class circuitry, without the need for any additional purchases.

The Onkyo A-9070 integrated amplifier hides some controls in a flip-down panel on the front of the unit

A "transformer" too

You might not need other components once deemed essential, either. This amp has four discrete modes that effectively turn it into three separate components. Its primary function is as an integrated amp, of course, but you can also use its preamp section to feed a separate power amp, or use its power amp with a preamp or receiver. Plus there's a split preamp/power amp mode that allows you to splice in a component in the path, like an equalizer. This unique flexibility means the A-9070 can be an excellent add-on upgrade for your home theater receiver, giving you options for great stereo music and extra power for your surround setup. And that's just one possible configuration. However you use the A-9070 in your system, you'll appreciate the build quality and attention to detail evident in touches like the machined, gold-plated input and output terminals.

Everything you always wanted in a stereo receiver, except the radio

An integrated amplifier is essentially a receiver without a built-in AM/FM tuner. You get power to drive your speakers, audio controls, and inputs for music source components. Connect an iPod, a computer, a network music player, or any other device that can play Internet radio, and you may find you have no need for an AM/FM radio.

DIDRC (Dynamic Intermodulation Distortion Reduction Circuitry): Since
the advent of digital audio, signal-to-noise ratios have improved dramatically.
However, the S/N ratio reflects static noise only, and takes no account of
another type of noise that occurs as the byproduct of sound reproduction;
dynamic noise. To reduce this type of noise, Onkyo has developed DIDRC
technology. Despite being beyond the normal range of human hearing, frequencies
above 100 kHz are susceptible to clock pulse and other forms of distortion from
digital devices. Such distortion in the super-high-frequency range can generate
"beat interference", which in turn affects the character of the original sound.
By improving linearity and reducing distortion in the super-high frequency
range, Onkyo's new DIDRC technology effectively reduces perceptible noise and
delivers clearer, truer audio.

Low NFB (Negative-Feedback Design): Too much NFB makes
a system susceptible to counter-electromotive force from the speakers,
resulting in a drop in perceived sound quality. To avoid this, Onkyo focuses
on improving the frequency response and reducing distortion, without relying
so much on NFB.

Closed Ground-Loop Circuits: AWRAT amplifiers employ a
sophisticated closed-circuit design in which each circuit has a separate
link to the power supply. This helps to cancel individual circuit noise and
keep the ground potential free of distortion.

HICC (High Instantaneous-Current Capability): HICC
enables an AWRAT amplifier to immediately cancel the speakers' reflex energy
and instantaneously send out the next signal. The same high current required
to achieve this also supports the amplifier's ability to handle speaker
impedance fluctuations.

Symmetrical Twin-Monaural Construction: Power devices
for the left and right channels of an AWRAT amplifier is aligned
symmetrically. Each channel has the same electrical and structural design,
and signal pathways are uniform in length. This helps to minimize errors in
stereophonic playback.

New Circuit Board Construction w/ Internal Struts to Reduce
Vibration: Rather than being directly connected to the chassis base, the
circuit boards inside the A-9070 are cushioned by internal struts and affixed to
the front, side, and rear panels. This method of construction prevents
vibrations from the chassis from adversely affecting the circuit boards

Dual Wolfson 24-bit/192kHz DACs: High-quality Wolfson DACs
work to optimize analog audio performance on the A-9070. The integrated amp
features dual 24-bit WM8742 DACs, which support sampling rates of up to 192 kHz.
Although these DACs are specified to handle two-channel audio on a single chip,
Onkyo employs separate chips for each stereo channel to ensure the most accurate
digital-to-analog conversion.

PLL Ultra-Low Jitter Technology: Jitter is an unwanted
side-effect of the digital-to-analog conversion process caused by fluctuations
in the time domain of a digital signal. PLL ultra-low jitter technology reduces
jitter by comparing the input and output phases of the digital signal and
creating an accurate clock waveform. This enhances the precision of digital
signal processing and noticeably improves perceived audio quality.

Optimum Gain Volume Circuitry: Conventional
volume-attenuation methods involve initially dropping a signal close to the
amplifier's natural noise floor at low volumes. The signal can then become
tainted with noise, which subsequently gets amplified along with the signal.
Onkyo's Optimum Gain Volume Control Circuitry adjusts the gain so that less than
half the typical amount of attenuation is necessary. The signal never comes
close to the noise floor, and the result is noticeably clearer sound when
compared to conventional amplifier designs.

Phase Matching Bass Technology: From the warm low notes produced by a
cello to the deep frequencies of electronic music, a good audio system should be
able to deliver plenty of bass response. While many bass enhancement circuitries
effectively boost low-frequency sound, they are often prone to the effects of
phase shifting, which can overwhelm mid-range frequencies and muddy the sound.
Onkyo's Phase-Matching Bass Boost Technology effectively preserves mid-range
clarity-allowing vocals and strings to sound great; while maintaining a smooth,
powerful bass response at all volume levels.

High Output Transformer: At the heart of this integrated amplifier, you'll find a power supply that can maintain
or increase output power as required. Musically, this means that you'll have
deep, powerful bass; wide-ranging dynamics; musical peaks that sound composed;
and correct timbre and sound staging. The A-9070's high-output power
transformer, four 15,000 μF
capacitors, and low-impedance copper bus bars work in concert to enhance the
power and fidelity of your audio sources.

Anti-Resonant Chassis: To prevent vibration, a 1.6mm
anti-resonant chassis is used to isolate the audio signal from any interference
during the amplification process. This rugged chassis is superbly finished with
an aluminum front panel and volume control.

Independent Headphone Amplifier: The Onkyo A-9070 features a built-in,
independent headphone amplifier and a front-panel 1/4" headphone jack. You can
adjust the volume of the headphone amp independently from the integrated amp's
main volume. You can adjust the headphone level from -12dB to + 12dB.

Controls

Four Discrete Amplifier Modes: At the turn of a knob, the Onkyo
A-9070 can be configured to run in any one of four distinct modes. Depending on
how you want to integrate it into your hi-fi system, you can use it as an
integrated amp, as a power amp, or as a pre-amp. On top of that, you can also
set up the A-9070 in split mode. This enables the pre-amp and power amp to work
separately, so you can incorporate another device, such as an equalizer.

A/B Speaker Selector: You can choose to output sound from Speakers A,
Speakers B or both Speakers A &B.

Tone Control: You can independently adjust the Bass (100Hz) and Treble
(10kHz) of the Onkyo A-9070 from -14 to +14 dB; as well as adjust the balance of
the left and right speakers.

Direct Mode: By bypassing the tone control circuit, the Direct Mode
uses the shortest path for enhanced sound quality. Also, since the left/right
balance setting doesn't affect the sound quality, the balance can still be
adjusted even if the Direct Mode is enabled.

De-Emphasis Function: When a signal treated for treble emphasis
(pre-emphasis) is detected, the integrated amplifier is designed to restore the
original signal characteristics via the "de-emphasis" process. This function
only applies to the following digital audio sampling rates - 32kHz, 44.1kHz, &
48kHz (other sampling rates are not supported).

Auto Standby: When the Auto Standby function is activated, the
integrated amplifier will automatically enter Standby mode if there is no
operation and no audio signal input for 30 minutes.

Remote Control: The Onkyo A-9070 includes an IR remote control for
wireless operation of the integrated amplifier and RI-connected Onkyo
components.

RI (Remote Interactive) Control: Onkyo's RI system lets you operate
multiple RI-compatible Onkyo audio components through a single remote control.
On the rear-panel of the A-9070, you'll find two RI ports (3.5mm) to link
another Onkyo component (such as a CD player, iPod dock, or tuner), enabling
limited control of your setup using the integrated amp's remote.

Auto Power On: When you start playback of an Onkyo component
connected via RI while the integrated amplifier is in Standby mode, the
integrated amp will automatically turn on and select that component as the
input source.

Direct Change: When playback is started from an Onkyo component
connected via RI, the integrated amp automatically selects that component as
the input source.

Remote Control: You can use the integrated amp's remote control
to operate your RI connected Onkyo components by pointing the remote at the
integrated amplifier's remote control sensor instead of the component.

System Off: When you turn off the integrated amplifier, your RI
connected Onkyo components will turn off automatically.

Connections

3 Digital Audio Inputs: The A-9070 features a 24-bit/96kHz optical
(toslink) input and
dual 24-bit/192kHz coaxial (RCA) inputs that can carry digital audio signals from source devices (such
as a computer or laptop) for processing by the integrated amp's dual Wolfson 24-bit/192 kHz
DACs. The digital inputs do not support multichannel audio
signal; PCM signal only.

Note: You can change the name of the currently selected analog or
digital input (not Phono input). Choose from CD, SACD, MD, Tape, Tuner, TV,
Game, PC, or Dock. You can also hide the display of inputs that are not
being used.

Main In Jacks: The stereo RCA Main Input jacks allow you to connect
an equalizer or preamplifier to the Onkyo A-9070.

Speaker A/B Terminals: The Onkyo A-9070 is equipped with A & B speaker
terminals to connect up to two pair of speakers. The receiver uses gold-plated
binding post connectors for the A & B speaker outputs. The binding posts are not
5-way because a plastic collar prevents their use with spade lugs; they will
accept bare wire (up to 10AWG), pin connectors, single banana plugs, and dual
banana plugs. You can output sound to only Speaker A, only Speaker B, or both A
& B Speaker. You can also choose to bi-wire a single of pair of speaker using
the integrated amp's A &B speaker terminals. This provides improved bass and
treble performance.

Note: If you are connecting only one pair of speakers, you can use
speakers with an impedance of 4- to 16-ohm. If you are connecting two pair
of speakers, you can use speakers with an impedance of 8- to 16-ohm.

Preamp Outputs: The A-9070's gold-plated stereo preamp outputs allow
you to connect the integrated amplifier to a power amp, so it can be used as a
preamplifier.

1/4" Headphone Jack: The A-9070 is fitted with a front-panel 1/4" headphone
jack to connect a set of headphones for private listening. While headphones are
connected, no sound is output from the integrated amplifier's speaker terminals
or preamp outputs.

RI Remote Control Jacks: The two 1/8" RI remote control jacks
allow you to connect this receiver to other compatible Onkyo components.

Detachable AC Power Cord: The A-9070 includes a detachable 6' AC
power cord.

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The lion with tender touch

Written By Sedux, Dubrovnik on Friday, November 07, 2014

Few days ago visited my friend to listen this amp.As I have Vincent SV-237 I thought I am wasting my time...Lord I was wrong..what a space,what a deep bass ,what a clear sound,what a power..yes Vincent has it all - almost twice the power ( 2 x 250 w on 4 ohm) but is costing more then twice...however there was something in the sound I just couldn't resist not to fall in love with this awesome amp once I connected it with my tower boxes Sigma 1000 from Magnat - its musicality was so great that I instantly sold Vincent and bought this beauty.It is a MUST HAVE amplifier !

Onkyo A-9070

The clarity of sound reproduction with this amp is excellent. The power is sufficient. I am running two pair of tower speakers, two pair of book shelf sized speakers, and one powered sub-woofer with it. It powers the speakers all very well. The sub has it's own power. I did have to purchase a "speaker selector", to help protect the amp. I would give it five stars except for two issues. One, it has no powered outlets in the back of it. I have a cooler that sits over top of the amp placement, and a powered AC plug-in would turn off the cooler when the amp is turned off. No big deal, as I unplug everything when the stereo is not in use.The other issue is that it will only take 14 gauge speaker wire. It also takes quite a bit of manual dexterity to get the wires seated correctly into these terminals. Just a simple terminal where you could use spade lug type connectors would be much easier to use. All that being said, I wouldn't trade this amp for anything. Onkyo has a real winner here.

Pros:Has plenty of RCA connectors, two coaxial connectors, and an optical connector.

Cons:Could use one or two AC plug-ins, powered to go on and off with the amp. The speaker terminals aren't the easiest to use.

Excellent sound

I always used it in the direct mode and experimented with feeding a couple of CD players (Koala tube CDP and a discontinued Sony SACD disc changer, SCD-C2000ES) by using analog, coaxial or optical connections. In all connection types, A-9070 performed very well, with no audible differences to my ears. I would eventually prefer using the optical digital cable (or coaxial digital cable) due to its simplicity to feed that pair of DAC chips in the amplifier. Therefore, one does not need an expensive CD player (with 24-bit/192 kHZ chip and all those surrounding circuitry on the CD player) to own with this superb amp, one would only need a reliable disc spinner and feed that spinner's unprocessed, digital output directly to this amp w/DAC using a simple digital optical or digital coaxial cable. This is a well-designed amp with crystal clear sound (in comparison to that tranquilized sound of my old tube amp which was also producing, for 6 years, for my room lots of heat through its old-school transformers) resulting in no listening fatigue at all. After wasting 6 years with my old tube amp, now, thanks to A-9070, is the time for me to discover those tiny details and nuances remained unheard in my favorite CDs. Onkyo A-9070 is a good amp, with an onboard DAC, exhibiting a high-level of electronics craftsmanship, at a sweet spot in price-wise comparison to its competitors such as Yamaha S1000 and S2000 (both w/o DAC), Music Hall a70.2 (w/o DAC) and Peachtree Audio Nova125 (w/DAC).

The Onkyo A-9070 delivers!

I extensively researched the Onkyo A-9070 and three other comparable integrated amplifiers before making a decision. I am very pleased to have chosen the Onkyo A-9070. It is built very well with audiophile-quality parts, and it is highly versatile (it can be configured to perform in any one of four distinct modes) with many features. The separate Wolfson 192 kHz/24-Bit DACs feature really makes a difference in the sound. My CDs, LPs, and tapes sound so much clearer and with an enhanced definition. I highly recommend this product for its sound, quality, reliability, and price.

onkyo A 9070

I bought this integrated amp after doing hours and hours of research and sound testing of other integrated amps. What I found is you essentially you have to just leave it up to ones own ears to make the decision. Forget about manufacturer names and price tags. This product is excellent and the build quality is second to none at this price point. It is also extremely versatile.

Onkyo 9070 a pleasure to listen too

The sounds from this unit are nothing short of amazing! I have logged in 90 hours of listening in the two weeks since it arrived. Ran the Stereophole test discs and was especially impressed with the sound stage demo and guitar track details. I have used these before with other amps and there was just so more presence, imaging and detail. With streaming media digital inputs there was no need for new speakers with this amp. It brought out the best in them despite their age.

Pros:Separate DAC for R and L channels
No hum or noise during silent track segments
Massive transformers this amp weighs almost 50 pounds
Life like vocal and instrumental sounds
Many connection and functionality options provided

Cons:The unit runs a little hot (94F) but very stable if ventilation is proper (12 " clearance on top is a lot in a rack)

Great amp

Written By Chris, Vancouver, BC on Friday, November 23, 2012

This is a great sounding receiver that doesn't seem to be getting much attention. It's a modern version of older "built like tank" amps of the 70's. Do a Google image search and take a look inside. It's got a massive transformer, huge heat sinks, and big capacitors. Then take a look at the power supply and heat sinks of other amps claiming 75 W per channel (8 ohms). This unit has a bigger power supply for 2 channels than most have for 7 channels! I was almost going to buy a two channel receiver from a different "high end" brand that was also rated at 75 W. Then I noticed that the Onkyo is over TWICE AS HEAVY as the other one. After taking a look inside I found out why. Oh yeah, the Onkyo also sounds better.